When did the lower attaching hole configuration change?

Had a look at various sources quickly - I couldn't find any definite answer. Others here have more resources.
The 2 holes on the underside were used in UK also. They had an earlier pattern too, then deleted the shroud altogether around '67 on their Mk2s.

The only definite thing I can help you with is that my '69 mini K (owned from new) has the single hole on the underside - LH and RH.

Just had a look at the Australian engineering drawing for these parts, called Cover, Radius Arm with part numbers HYA3808 (RH) and HYA3809 (LH). The drawing was issued 6/4/1965, which is the date the Oz manufactured parts replaced the UK equivalent parts - 14A6615 and 14A6616. The drawing shows a single hole in that spot.

The only change documented on the drawing is on 15/5/1975 when the finish was altered from "body colour" to "grey".

Maybe the part with two holes is of UK or other non-Oz manufacture, or even aftermarket.

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ex-NSW Police 1970 MK II Cooper S
VMCI #43

The Oz part number does appear to be available! I can only find Uk versions.

Sorry, I don't understand your point. Did you mean "does not appear to be available"?

In any case, the Oz part is exactly the same as the UK part, just manufactured locally, partly to boost the Government's local content incentive at the time. The same applied to most other parts. The UK engineering drawing was simply given an Australian part number and then manufactured here.

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ex-NSW Police 1970 MK II Cooper S
VMCI #43

My point is, it appears that the one holed Oz version is not found on Google whereas the two holed UK version is avaiable on Google. I am looking for the one holed versions.

When you say "on Google" you are actually looking to purchase the Oz versions, yes? If that's the case you are very unlikely to find them New Old Stock. As far as I know the Oz Mini parts outlets all sell the UK version (with the two holes) under the UK part numbers.

If you are happy with used Oz covers there should be plenty about. Put a Wanted advert on here, or try contacting the parts suppliers who dismantle cars.

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ex-NSW Police 1970 MK II Cooper S
VMCI #43

How many do you need?

If you have one with a 2 hole what's wrong with welding up the other hole and sanding flush

Funny how these items pop up when we start to talk about them. https://www.ebay.com.au/itm/MINI-RADIUS ... 0033.m2042

Complete with dent. My s/h ones are in better condition!

I don't think my welding skills would do it.

Place a piece of copper (flattened copper pipe will do) behind the hole. Then try and weld it to the copper through the hole.
You can't weld it to the copper, so you just end up filling the hole
Grind smooth, and your done

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